Method of bonding metal to insulation



P 1941- w. OSENBERG 2,255,184

METHOD OF BONDING METAL TO INSULATION Filed Jan. 22, 1938 2 Shets-Sheet 1 I 7 x 7/ I 17 t. f

Sept 9, 1941. w. OSENBERG 2,255,184

ME'I'BOD OF BONDJPNG METAL T0 INSULATION Y Filed Jan. 22, 1938 2 Sheets-Sheet 2 eased Sept. 9,1941

UNITED STATE.

NEETHOD OF S FATE 2,255,184 BONDINGMETAL 'ro QFFlCE' INSULATION Werner Osenberg, Dresden, Germany Application January 22, 1938, Serial No. 186,284 I 1 Claim. 1C1. 18-59) metal part introduced therein. This process results in difiiculties, because the cement mass relied on to effect the connection between the metal and the insulating pieces takes extraordinarily long to harden, so that several hours elapse before the metal part is maintained securely in place, and the assembly may be removed from the mounting jigs In order to avoid the difliculties incurred in introducing the metalparts in the mass of cement previously introduced into the depression, it has been proposed to provide bores clear through the insulating body into which the metal part is first introduced and retained, whereupon the binding means is introduced through the opening afforded by the bore. In such practice, materially more cement or binding material, it becomes secured in the insulating body in the desired position.

Various materials may be used as the material to be forced into place. One condition for its use is that it shall remain'liquid under high pressure and corresponding temperature, but under reduction of pressure shall rapidly harden. The composition of the binding medium is to be adapted to these requirements. Metals and alloys as well as artificial resin sprays may serve as binding mea In the accompanying drawings in which are shown one or more of various possible embodi ments the several features of the invention:

Fig. 1- is a view in longitudinal cross-section showing one embodiment of the process,

Fig. 2 is a fragmentary plan view thereof, Fig. 3 is a cross-sectional viewo'i another embodiment,

Fig. 4 is a cross-sectional view of a modification of the latter,

Fig. 5 is a cross-sectional view illustrating the method of applying the binding means through the metal element,

ing means is required and the danger is incurred that in the introduction into the bore, the ce-- ment will not become uniformly lodged in the space between the metal part and. the insulating body, so that the security of the assembly is not always dependable.

It is, moreover, clear that such bores of relatively large diameter result in appreciable weakening of the insulating body, especially so where its dimensions are small as is frequently the case in insulating structures.

These difficulties are overcome according to the present invention, where the space into which the binding means is introduced is closed on all sides thereof, and only a single inlet' is provided through which the binding means is introduced mechanically under pressure. The mechanical introduction is preferably effected by means of-nozzle devices in themselves known. The inlet to the space may be provided either in the metal part or in the insulating body. Thediameter of the inlet may be very small so that no deleterious reduction in cross-section may result. If narrow elongated bodies are to be secured, the space may be formedas a slit. Prior to forcing in of the material, the metal part is introduced in the cavity in the insulating body,

- and so disposed that after hardening of the bind- Fig. 6 is a modification designed to enhance the efiectiveness of the binding,

Fig. 'l is an arrangement alternative to that shown in Fig, 6,

Fig. 8 is; another modification thereof,

Fig. 9 is a viewin longitudinal cross-section showing the application of a collar to a rod,

Fig. 1c is a view in longitudinal cross-section showing the method of applying a yoke-shaped end to a ceramic carrier,

Fig. 11 is a view in longitudinal cross-section showing the attachment of two pieces in faceto-face contact according to the principles of the present invention,

Fig. 12 is a view similar to Fig. 11 showingv the application of a threaded shell against the mounting surface,

Fig. 13 is a view in longitudinal cross-section showing the method of simultaneously binding a plurality of metallic pieces to a common ceramic carrier,

Fig. 14 is a view showing the attachment of two pieces by means of a. rivet-like connector applied according to my invention, 1 I

Fig. 15 is a view in longitudinal cross-section showing the application of auxiliary means for positioning a plurality of metal pieces with respect to the ceramic body in carrying out process of the invention, and

Fig. 16 is a plan view thereof.

the

bindin in longitudinal cross-section nozzle is superposed upon .as a shaft II,

tion, a slit 1 is provided in the nozzle, by means 01' which said nozzle head becomes resilient to facilitate introduction and removal of the metal parts therefrom. The nozzle 4 is adiusted in position by vertical movement, as indicated by arrows in Fig. 1. Before the nozzle is disposed upon the ceramic 'part I, the metal piece 2 is introduced into the opening I. Thereupon, the the ceramic body and the stud end thereof extends into well I while the shank thereof protrudes from said well. The

forcing in of the binding means occurs through the conduit II ture. As soon as this operation has been completed. the nozzle element is raised, whereby, by

reason of the light resilient hold 'of the metal part 2 in the bore I, the latter will pass over and release the same. After hardening of the binding means, part 2 will be securely bonded to the ceramic part I, which may now be removed from the carrier 3, and the operation repeated in quantity production.

In the embodiment of Fig. 3, the metal piece 2 is formed with a flange 9 which itself completely closes the cavity I. For introduction oi the binding means, a special conduit II is provided in the insulating body 3 through which in the arm of the nozzle structhe binding means is introduced with the aid of a nozzle II. formation at its outer end and the nozzle II is correspondingly formed to facilitate application thereof.

The embodiment of Fig. 4 diflers from that of Fig. 3 solely in that the conduit II in the ceramic is disposed below the cavity I instead of laterally thereof as in Fig. 3. In the embodiment of Fig. 5, the metal part 2 is provided with a corresponding conduit III therein directly through which the binding means may be conveyed to the cavity I. In the embodiment of Fig. 6, the security of connection is enhanced in that the wall of the cavity I and the lower end of the metal part 2 are provided with grooves I and I2 respectively into which the binding medium enters. In the embodiment of Fig. '7, the cavity I into which the binding means is introduced, is closed at one side by the flange I of the metal part 2 and at the other face by the corresponding conformation of the nozzle II. Preferably, the cavity I is spool-shaped, as shown. In this arrangement,

' the advantage results that in the eventual shrinking of the binding medium. the security of the same will be enhanced. As shown in the embodiment of Fig. 8,. an interlay Il may be secured in the course of attaching the metal part 2' between the latter and the insulating body I, and this interlay may consist of conductors, wires, plates or the like.

In Fig. 9 is shown an application of the process, where the insulating body is formed for instance upon which a metallic shell II is mounted. In this case, both parts are provided with reduced portions I'|-I8, and are disposed into a mold, which tightly encloses the same on all sides and presents an annular cav ty only The conduit III has a conical in the region formed by the reduced portions. into which the binding means is introduced through the duct II by means of a nozzle II.

As shown in .Fig. 10, the metal part 2 could be yoke-shaped in cross-section or U-formed, and its prongs I! may be introduced into corresponding depressions in the ceramic body I, so that a small intervening cavity I results which is filled with the binding medium. In this embodiment, the cross-sectional form of the metal part 2 and the cavity in the insulating body I may be varied. The yoke arms is for instance, may be parallel to each other and they may be parts of a circular body.

In the embodiment of Figa. l1 and 12, as distinguished from the other embodiments, that annular space is not. provided between the ceramic and the metal parts. In Fig. 11, for instance, the ceramic part and the metallic part are provided with opposed cavities 202I,' which form a unitary closed cavity I, into which the with respect to the ceramic body I, wherein upon eventual shrinkase of the material introduced,

the two pieces are securely drawn together at their contacting faces.

"Fig. 12 shows a similar embodiment in which a metalpant formed as a screw shell, is secured to a ceramic part I. The ceramic part of this purpose, has a bore of tenon-shaped cross-section, whereby its smaller end faces the cylindrical opening of the shell. The binding medium is introduced through the upper opening of the screw shell and completely fills the cavity I as shown in Fig. 12, and part of the tapped bore of the screw shell '22. In Fig. 13 is shown an embodiment in which the insulating body I has several cavities into which the metal parts 2 extend at their mounting ends and in which the neighboring cavities I are connected together by means of channels 23 through the ceramic body, whereby only a singleinlet opening 24 for the introduction of the nozzle is provided, whereby with a single application of the nozzle, a plurality of adjoining cavities may be simultaneously provided with the binding medium. In Fig. 14 the cavity I into which the binding medium is to be interposed, is so shaped as to afford a countersunk rivet shank. For this purpose, the ceramic part I and the metal part 2 are provided with boreswhich are axially aligned to correspond to the countersunk rivet shank. The rivet head projecting outwardly is provided by the use of an auxiliary piece 2I whichhas a corresponding depression therein. Introduction of the binding medium occurs by aid of the nozzle II. I V

In Figs. 15 and 16 is shown an embodiment for efl'ecting the assembly between the metal parts 2 and the ceramic body I, where the metal parts are devoid of any means for properly locating them with respect to the ceramic part. In this case, the metallic parts 2 are introduced into a carrier piece 28. The ceramic part I also may be disposed into a under piece 21. If now, the carrier piece 2I is superposed upon the ceramic body I and its carrier piece 21, then the metal parts 2 are accurately disposed relative to the cavities in the ceramic piece I. As soon as this relative positioning is attained. the introduction of the binding medium may be effected, with the aid of nozzles II, as for instance in Fig. 16.

ably greater than that of said stud and accom-- modating the latter with considerable clearance and thereupon introducing under pressure into a small bore leading into said otherwise completely closed well a jet-of hot binding medium inliquid state completely to fill said well, whereby upon setting thereof, said stud will be completely embedded and permanently fixed in the position in which it was originally supported from the mouth of said well.

WERNER OSENBERG. 

